What peptide would you expect to result from a 21-nucleotide-long dna sequence that contains only the base adenine?
a. peptide composed of 21 phe
b. peptide composed of 7 phe
c. peptide composed of 7 lys
d. peptide composed of 21 lys

I think that all of the above are correct.
if you have to pick 1. i would suggest that you pick  A.
dose this help?

The answer is overmatching

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.